Dielectric effect on the rf characteristics of a helical groove travelling wave tube
Wei Yan-Yu (魏彦玉)a, Wang Wen-Xiang (王文祥)a, Sun Jia-Hong (孙嘉鸿)a, Liu Sheng-Gang (刘盛纲)a, Baofu Jiaab, Gun-Sik Parkb
a National Key Laboratory of High Power Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China; b Vacuum Electrophysical National Laboratory, Department of Physics, Seoul National University, Korea
Abstract A new type of partial-dielectric-loaded helical groove slow-wave structure (SWS) for millimetre wave travelling wave tube (TWT) is presented in this paper. The radio-frequency characteristics including the dispersion properties, the longitudinal electric field distribution and the beam-wave coupling impedance of this structure are analysed. The results show that the dispersion of the helical groove circuit is weakened, the phase velocity is reduced and the position of the maximum Ez is moved from the mouth to the inside of the groove after partially filling the dielectric materials in the helical groove SWS. Therefore, the dielectric-loaded helical groove SWS is suitable for a multi-beam TWT with broad band and high gain.
Received: 14 February 2001
Revised: 02 November 2001
Accepted manuscript online:
PACS:
77.84.-s
(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)
Fund: Project supported by the Fund of the Institute of Electronics Science of the Ministry of Electron Industry (Grant No DJ3.1.1.2).
Cite this article:
Wei Yan-Yu (魏彦玉), Wang Wen-Xiang (王文祥), Sun Jia-Hong (孙嘉鸿), Liu Sheng-Gang (刘盛纲), Baofu Jia, Gun-Sik Park Dielectric effect on the rf characteristics of a helical groove travelling wave tube 2002 Chinese Physics 11 277
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